Nickel Alloy X-750 CD-SPR vs X-750-STA
Nickel Alloy · X-750 temper comparison
X-750 CD-SPR and X-750-STA are two conditions of the same nickel alloy grade, X-750: CD-SPR (no.1 Temper) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. X-750 CD-SPR is the stronger of the two: yield strength 1,240 MPa (180 ksi) against 815 MPa (118 ksi) for X-750-STA, about 52% more; tensile strength follows at 1,450 MPa (210 ksi) vs 1,200 MPa (174 ksi). In exchange, X-750-STA is the more ductile: elongation 24% versus 6% for X-750 CD-SPR, and X-750 CD-SPR is harder (390 HB vs 302 HB). X-750-STA runs hotter in service (760°C vs 425°C continuous). On the shop floor, X-750-STA welds better (fair vs poor).
X-750 CD-SPRChoose it when strength drives the design.
X-750-STAChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
X-750 CD-SPR vs X-750-STA: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all nickel alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all nickel alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Shear Modulus 83 GPa12 Msi · Bulk Modulus 188 GPa27.3 Msi · Poisson's Ratio 0.31
Physical
Density and transition temperatures.
Same in both: Density 8.28 g/cm³0.3 lb/in³ · Melting Point (Solidus) 1,393°C2,539 °F · Liquidus Temperature 1,427°C2,601 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 12 W/m·K6.9 BTU/hr·ft·°F · Specific Heat Capacity 431 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.6 µm/m·K7 µin/in·°F · Latent Heat of Fusion 290 J/g125 BTU/lb · Min Service Temperature -253°C-423 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.4 % IACS · Electrical Resistivity 1.22×10⁻⁶ Ω·m48 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 35 / 100 · Brazeability / Solderability 45 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 290 MJ/kg124,678 BTU/lb · Embodied Carbon (primary production) 17.5 kg CO₂/kg · Embodied Water 300 L/kg35.9 gal/lb · Typical Recycled Content 35%
Strength versus weight
Yield strength against density for every nickel alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
X-750 CD-SPR vs X-750-STA — frequently asked
Is X-750 CD-SPR stronger than X-750-STA?
Yes. X-750 CD-SPR has a typical yield strength of 1,240 MPa (180 ksi) against 815 MPa (118 ksi) for X-750-STA — about 52% more. Tensile strength is 1,450 MPa (210 ksi) vs 1,200 MPa (174 ksi).
Which condition does FabDigit quote by default, CD-SPR or STA?
STA is the default X-750 condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which welds better, X-750 CD-SPR or X-750-STA?
X-750-STA. Its weldability rates fair (40/100) against poor (25/100) for X-750 CD-SPR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in X-750 CD-SPR and X-750-STA side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.